White and colorless microcrystals of the rare mineral lannonite from the Anna Mine (Alsdorf, Cologne, North Rhine - Westphalia, Germany). — Photo: David Hospital · CC BY-SA 4.0
Lannonite
Lannonite is an IMA-recognized mineral species in the sulfate class, with the chemical formula HCa₄Mg₂Al₄(SO₄)₈F₉·32H₂O.
It crystallizes in the tetragonal crystal system.
Key properties: Mohs hardness 2; specific gravity 2.22; optically uniaxial.
IMA symbol Lnn, IMA status: approved, named in 1979.
A rare post-mine mineral deposited from solutions derived from an oxidizing breccia zone.
It is found associated with Fluorite, gypsum, khademite, wilcoxite, pyrite.
The mineral was named to honor Dan Lannon, who early staked claims in the Wilcox district, New Mexico, USA.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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